【摘要】：渤海萊州灣地區(qū)處于海陸交互作用的過渡帶地區(qū),是全球氣候變化和區(qū)域地質(zhì)作用的敏感地帶,沉積物的沉積速度較快,可以將不斷變化的海陸作用和氣候變革等環(huán)境信息記載下來。論文以渤海萊州灣西南岸GK138孔、GK111孔、GK95孔、GK59孔GK74孔、GK79和GK89鉆孔等7 口巖心樣品為研究對象,分析各個鉆孔有孔蟲的組成及垂向分布特征,探討有孔蟲種類分布、共生組合特征及地質(zhì)環(huán)境意義,結(jié)合測年資料和聚類結(jié)果對鉆孔進(jìn)行沉積單元劃分和分析其沉積環(huán)境,并進(jìn)一步討論第四紀(jì)晚期以來的沉積環(huán)境演化。研究區(qū)7 口鉆孔樣品中總共鑒定出有孔蟲16屬35種,以原生底棲有孔蟲為優(yōu)勢種,優(yōu)勢種主要有:Ammonia beccarii,Ammonia annectens,Ammonia takanabensis, Ammonia convexus, Ammonia sobrina, Elphidium limpidum ,Elphidium advenum, Elphidium excavatum, Astrononion italicum 等。通過鉆孔的沉積單元分析揭示不同期次的海侵過程,發(fā)現(xiàn)每次海侵過程中海相地層的頂、底板高程和厚度存在不同程度的差異,其中GK138孔、GK111孔、GK95孔、GK59孔和GK79可以揭示出3套海相地層,GK74揭示出2套海相地層以及GK89揭示1套海相地層,通過地層對比發(fā)現(xiàn)三次海侵分別發(fā)育于中更新世末期、晚更新世和全新世期間。通過與全球海平面升降曲線相對比發(fā)現(xiàn)3套海相沉積地層從早到晚劃分于MIS7、MIS5和MIS1期間的高海平面階段。與渤海沿岸地域許多鉆孔的交叉比較發(fā)現(xiàn)研究區(qū)海侵期間沉積地層分布較連續(xù),因而具有很好的可對比性。不同海相地層頂、底地層的高度和厚度的差別揭示了區(qū)內(nèi)發(fā)生過不同期次、不同強度的構(gòu)造運動。
[Abstract]:The Laizhou Bay area of the Bohai Sea is located in the transitional zone of ocean-land interaction, which is sensitive to global climate change and regional geological processes. Environmental information such as changing land and sea processes and climate change can be documented. In this paper, seven core samples from GK138, GK111, GK95, GK59, GK79 and GK89 boreholes in the southwestern coast of Laizhou Bay, Bohai Sea, are studied. The foraminifera composition and vertical distribution of each borehole are analyzed, and the distribution of foraminifera species is discussed. The characteristics of symbiotic assemblage and the significance of geological environment, combined with the dating data and clustering results, are used to divide the sedimentary units and analyze the sedimentary environment of the boreholes, and the evolution of the sedimentary environment since the late Quaternary is further discussed. A total of 16 genera and 35 species of foraminifera were identified from 7 borehole samples in the study area, with primary benthic foraminifera as the dominant species. The dominant species were: Ammonia beccarii,Ammonia annectens,Ammonia takanabensis, Ammonia convexus, Ammonia sobrina, Elphidium limpidum, Elphidium advenum, Elphidium excavatum, Astrononion italicum et al. The sediment unit analysis of the borehole reveals the transgression process in different periods. It is found that there are differences in the elevation and thickness of the top, bottom plate of the marine strata during each transgression, including the GK138 hole, the GK111 hole, the GK95 hole. GK59 pore and GK79 reveal 3 sets of marine strata, GK74 reveal 2 sets of marine strata and GK89 reveal 1 set of marine strata. Through stratigraphic correlation, it is found that three transgressions developed in the late Middle Pleistocene, late Pleistocene and Holocene respectively. By comparing with the global sea level rise and fall curve, it is found that three sets of marine sedimentary strata are divided into high sea level stages during MIS7,MIS5 and MIS1 from early to late. The cross-comparison with many boreholes along the coast of the Bohai Sea shows that the distribution of sedimentary strata in the study area during transgression is relatively continuous, so it has a good contrast. The difference of the height and thickness of the top and bottom strata of different marine strata reveals that there have been tectonic movements of different periods and different strength in the area.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P534.63;P512.2

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